Spock,
It strikes me a bit like ordering food in a restaurant. If, what arrives, isn't quite exactly what you expected it to be, the next question should be, 'Do I like it?'. For me, if the answer to that is yes, then I'd eat it, and pay for it. Or, in your case, keep the lens.
I understand your concerns. It isn't what you were expecting. A couple quick questions. Has your experience with this lens led to, at all, to believe that this is what you really wanted all along? If you could buy a used one in the same condition for a bit less, is it worth the hassle to return this one and do so? And last, but by no means least, do you really, still, want that old, classic lens?
If the answer to the last question is yes, then I'd return it. If you have a film body you can test it on, and you really wanted full frame coverage, it might be worth shooting a quick roll of film with it and looking at the resultant images with a critical eye. If you're happy after that, then I'd file the experience under 'bonus'. If not, I'd send it back.
I'm not, in any of this, trying to suggest they weren't less than truthful. It sounds like they were. Ultimately, the real question is, does this leave you farther ahead, or farther behind. No one can really answer that but you.
I have the DA 300 F/4, and I love it. I've considered the 200, but I have seen, and held the A* 300 2.8. I don't own one at the moment, but I probably will some day. Manual focus or FA, I'm not too concerned. If I ordered the A* 300 2.8 and got, say, the SDM 300 F/4, I'd be annoyed, and I'd return it.
Think of this, I would advise, as an opportunity to reflect on what it is you really want and need, and the react accordingly.
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